Milling mechanism



Sept. 28, 1948. I 5 1-, MORE) 2,450,350

MILLING MECHANISM Original- Filed July 26, 1943 4 Sheets-Sheet 1INVENTOR.

- A TTORNEYS Sept. 28, 1948. NORD 2,450,350

MILLING MECHANISM Original Filed July 26, 1943 v 4 SheetsSheet 2 1 76.8INVENTOR.

Sept. 28, 1948. I E. T. NORD 2,450,350

MILLING MECHANISM Original Filed July 26, 1943 4 Sheets-Sheet s 1 Y 1015 3 F g 15 ATTORNE Y5 Sept. 28, 1948. E. T. NOR-D I 2,450,350

MILLING MECHANISM Original Filed July 26, 1945 4 Sheets-Sheet 4INVENITOR. BY E RIC 7T NORD ATTokNEYs iatented Sept. 28, 1948 MILLINGMECHANISM Eric T. Nord, Amherst, Ohio, assignor to U. S.

Automatic Corporation, Amherst, Ohio, a corporation of Ohio Originalapplication 496,169, now 1945.

1944, Serial No. 542,412

2 Claims. 1

The invention relates to milling mechanism, and particularly tomechanism of this character adapted automatically to effect certainmilling cuts simultaneously on a plurality of small metal work pieces.The improved milling mechanism is one of the units of a milling andmarking machine disclosed in U. S. Letters Patent No. 2,381,- 921, andthe instant application is a divisional one of the application resultingin said Patent No. 2,381,921. The complete operation upon the small workpieces includes, as shown and fully described in said Patent No.2,381,921, certain periodic indexing movements of a work-holding drum inwhich the work pieces are mounted, and a marking of the work pieces withclassification or identifying indicia, and an ejecting thereof from themachine, in addition to the milling thereof by the improved milling unitherein particularly shown, described and claimed.

The invention is particularly illustrated in the following descriptionand accompanying drawings as applied to the milling of tubularend-flanged articles known a primer bodies.

The annexed drawings and the following description set forth in detailcertain means illustrating the improved milling mechanism, such meansconstituting, however, only one of the various forms in which theprinciple of the invention may be embodied.

In said annexed drawings:

Figure 1 is a front elevation of the complete machine by which themilling, as well as the marking and ejecting, is effected;

Figure 2 is a fragmentary plan view, upon an enlarged scale,particularly showing three of a bank of laterally aligned work piecesbeing subjected to a second of two certain consecutive millingoperations, the view showing certain milling cutters in section andindicating a certain rotatable drum and work holders secured thereto inwhich the pieces are held during the operations effected thereon, thesecond milling operation indicated being substantially completed, thisview being taken from the plane indicated by the line 2-2, Figure 1;

Figure 3 is a fragmentary transverse vertical section, taken in theplane indicated by the line 3-3, Figure 2 Figure 4 is an end view of oneof the work pieces after the complete operations of milling and markinghave been eilected thereon;

Figure 5 is a side elevation of the work piece shown in Figure 4;

Figure 6 is a right side elevation of the milling July 26, 1943, SerialNo. Patent No. 2,381,921, August 14, Divided and this application June27,

2 and marking machine, taken from the plane indicated by the line 6-6,Figure 1;

Figure '7 is a fragmentary vertical longitudinal section, upon anenlarged scale, taken from the plane indicated by the line '!l, Figure1;

Figure 8 is an enlarged side elevation of a certain cam and associatedmechanism detached from the machine, which elements control variousdifferential, periodic movements of certain milling spindles in whichare mounted the milling cutters;

Figure 9 is a fragmentary transverse vertical section, looking towardthe front of the machine, the View being taken from by the line9--9,Figure 6;

Figure 10 is a fragmentary horizontal section, taken on the planeindicated by the line l0-l0, Figure 9;

Figure 11 is a vertical longitudinal section of the complete milling andmarking machine, taken from the planes indicated by the line Hl|,Figures 1 and 12; and

Figure 12 is a plan section of the complete milling and marking machine,taken from the planes indicated by the line I2l2, Figures 6 and 11.

Referring to the annexed drawings in which the same parts are indicatedby the same respective numbers in the several views, the main frame ofthe improved milling and marking machine includes opposed side plates lerected upon a base 2. Supported by a bracket 3, Figure 11, pivotallymounted on a transverse shaft 4 supported in the upper portion of theside plates l at the rear of the machine is a motor 5, and supported onthe lower portion of the left side plate I, Figures 11 and 12, at therear of the machine is a motor 20. The motor 5 drives a plurality ofrotatable spindles 1, Figures 1, 6, 7, and 11, to eiiect the desiredmilling operations, and the motor 20 drives a cam shaft 25, Figures 1,6, 8, 11, and 12, to which are secured, on the left side of the machine,a lever 52, Figures 1 and 12, for effecting certain indexing movementsof a drum 50 upon which the work pieces 10 are mounted, Figures 1, 2, 3,7, and 11, and a cam 30 for controlling the locking of the drum 50between indexing movements thereof, Figures 1 and 12; upon the rightside of the machine, a cam 35, Figure 1, 6, 8, and 12, for effectingtransverse periodic differential movements of the rotatable millingspindles l, and a cam 40, Figures 1, 6, and 12, for actuating certainwork-clamping fingers I43, Figures 1, 2, 3, 6, '7, and 11; and,intermediate the Width of the machine, a worm wheel 46, Figthe planesindicated 3 ures 11 and 12, having a cam portion 45 secured to one facethereof for releasing certain springactuated marking plungers 68 from aholding plate, and a cam 65, Figures 11 and 12, for effecting theretraction of the spring-actuated'marking plungers 68.

The rotatable drum 50 in which the work pieces I are mounted while themilling and marking operations are effected thereon, and which makes onecomplete rotation while the cam shaft is making four rotations, isformed in its outer surface with four longitudinal plane surfacedrecesses 55, Figures 1, 2, 3, '7, and 11, each adjacent two of which area quadrant apart, in each of which recesses is secured by screws l IS aseries of transversely aligned plates 55, five plates 55 to a series,each plate 55 forming a work holder and having a cylindrical hole 56therethrough aligned with a hole 55 through the adjacent portion of thedrum 5% whereby a Work piece i 5, Figures 3, 4, and 5, can be insertedin said hole 55 with its inner end extended into the interior of thedrum 55 and a flange Iii formed on its outer end and limiting its innermovement lying flush at the in nor face of the flange with the outerface of the work-holding plate '55, Figures 3 and 11. In order that afreely rotating ejecting tube 26, Figure 11, hereinafter more fullymentioned, shall not roll upon the inner ends of the Work piece Ii], theplates 55, Figures 3 and 11, are formed with in,- wardly-extendingextensions seated in the holes 55 and having inner-end holes 56 throughwhich extend into the drum interior end-flanged knockout pins 3!provided inwardly of the plate extensions with transverse retaining pins32.

Before describing further detail of the machine assembly, the sequenceof operations will be outlined to wit:

A complete cycle of operations comprises the manual filling of onebar-1k of Work holders 55 with work pieces H a milling of the workpieces ill upon diametrically opposed portions of the flange i thereof,as indicated by the milling cuts H, Figures 2, 3, 4, and 5, a stampingof the desired identifying indicia upon the outer faces of the flangesid, as indicated by the marking 12, Figure 4, and the ejection from thedrum 55 of the workpieces iii thus milled and marked, Figure 11. Whileone bank of work pieces H] are being manually inserted in the workholders 55, another bank are being milled, anda third bank are beingmarked. These operations are effected between indexing movements of thedrum 5-8 and while the latter is stationary. The ejection of thecompleted work pieces H1 is effected during an indexing movement of thedrum 5%;

After the various operations have been completed on a bank of workpieces ill, a certain spring-actuated drum holding plunger 108, Figure1, is retracted to permit the fourth indexing ninety degree movement ofthe drum to complete a cycle of its movements. The drum-holding plungerI08 is retracted four times during a complete cycle, i. e, during onecomplete rotation of the drum 55, and the latted is indexed 90 duringeach such retraction, i. 6;, to move each bank of the work holder-s fromone station to the next respective station, which stations will now beparticularly described. The fourth indexing movement of the drum 50carries that bank of work holders 55 secured thereto shown at the bottomin Figures 1 and 11, to a position at the front end of the machine. Thisfront position of the work holders 55 is designated station A, Figures 1and 11, and is the position in which a fresh batch of work pieces I0 isloaded manually into a bank of work holders 55. Of course, if theoperation of the machine is just being started, station A would indicatethe position for the start of the first cycle. But, assuming the machinehas been previously started, the work holders 55, a quadrant in advanceof those shown at station "A in elevation in Figure 1, are on the top ofthe drum 50 and are loaded with work pieces I0 which are being milled.This position is designated as station B, Figures 1 and 11. The workholders 55, 180 in advance of those shown in elevation in Figure 1, andalso loaded with work pieces Ill, are at the rear of the drum 50 shownin Figures 1 and 11 and diametrically opposed to the work holders shownat station A in elevation in Figure 1. This position is designatedstation C and is the station at which the work pieces I B are marked andis particularly shown in Figure 11. The work holders 55 a quadrant tothe rear of the work holders 55 at station A shown in elevation inFigure 1 are at the bottom of the drum, indicated as station D, Figures1 and 11, and in moving to this bottom position there has been ejectedtherefrom, as illustrated in Figure 11, the work pieces H] which havebeen milled and marked at stations B and C, respectively. These severaloperations comprise a complete cycle of operations.

Various portions or cooperative assemblies of the machine will now bedescribed. 7

The detail of the drive by which the cam shaft 25 is actuated from themotor 20 comprises, Figures 11 and 12, a sprocket 15 secured to theshaft 2| extended from the casing of the motor '29 and engaged by achain 15 which also engages a sprocket 1! secured to and adjacent oneend of a longitudinal shaft 18 to whose other end is socured a gear 19engaging a gear secured to and adjacent one end of a parallellongitudinal shaft 8| adjacent Whose other end is secured a worm 82engaging a worm wheel 45 secured .to the cam shaft 25.

The detail by which the rotatable spindles I,

' in whose lower ends depending milling cutters 8 are secured, Figures1, 6, '7, and 11, are driven from the motor 5, comprises a pulley 86,Figure 11, secured to the shaft 6 extended from the casing of the motor5 and engaged by a longitudinally-extended belt 8! which also engages apulley 88, Figures 1, 6, and 11-, secured adjacent the top of a verticalshaft 89, to which shaft 89 is also secured adjacent its bottom end asprocket 90 en- :gaged by a chain 9i which also engages a .pair oftransversely spaced'sprocket-s 92, Figures 1, '6, 7, and 11, the chain9| between the sprocket 99 and the sprockets 92 also engaging an idlertake-up sprocket 94, Figures 6 and 11, rotatably mounted upon a pinmounted in a bracket 9! slidable on a transverse top frame member 33extended between the side plates I. The sprockets 92 are secured to twoof the rotatable spindles "I, the second and fourth, reading from theleft, Figure 1. There are six of these spindles "l. Each of thesespindles 1 is provided with a gear 93 rotatably fixed thereto adjacentlybelow the horizontal plane of the sprockets 92, Figure 7, and eachadjacent two of these gears 93 are rotatably engaged, so that all six ofthe rotatable spindles 1 are rotated from the two sprockets 92. It maybe stated that the reason for having six r'otatable spindles 1 formilling a bank of five work pieces lD'is that the work pieces I 0 areeach milled upon diametrically opposite portions of the flanges 10'thereof, Figures 2 and 4, and the milling of any one work piece It iseffected by an adjacent two of the milling cutters 8 which, betweenconsecutive milling operations, are shifted laterally of the machine adistance substantially equal to the distance between the milled recessesof adjacent work pieces Hi, so that the intermediate four millingcutters 8 each performs two milling operations, one each upon twoadjacent work pieces l3, and the two end milling cutters 8 each performsone milling operation, and that operation is upon the outside of the tworespectively adjacent end work pieces it, the outside milling cutters 8running respectively idle while the milling operations are beingeffected upon the inside portions of the respective two end work piecesIll. This action will be clearly seen in Figure 1 in which theright-hand end milling cutter 8 is running idly while the other fivemilling cutters 8 are effecting milling operations upon the left sidesof the five respective work pieces Ill. The milling cutters 8 runcontinuously during the operation of the machine, being spaced aboutmidway between milling positions during the indexing movements of thedrum 50, as hereinafter fully explained.

The detail by which the indexing of the drum 50 is effected comprises,Figure 1, transversely opposed spaced disks 53 and I!!! which aresecured adjacently exterior of the left-hand side plate I to thetransverse shaft 51 to is secured, of which disks 53 and H)! the disk 53is the outer one and is formed with four obliquely arranged slots 53which pass entirely through the body of the disk 53, and whose outerends are open at the periphery of the disk 53, the axes of these slots53' at these outer ends being a quadrant apart. These slots 53' areadapted to receive a roller 54, Figures 1 and 12, rotatably mounted upona pin I09 mounted in the outer end of an actuating arm 52 Whose innerend is secured to the cam shaft 25. The pressure of the roller upon thewalls of the slots 53' effects the indexing movements of the drum 50.During the nonindexing or dwell periods of the drum 5!), it ispositively locked by the engagement of a springactuated holding plungerI33 with certain peripheral recesses Hll" formed in the inner disk lfllwhich, as before stated, is also secured to the drum shaft 51. Theseperipheral recesses is! are four in number and the axes of each adjacenttwo are a quadrant apart. These recesses lfil of the disk Ill! arecorrelated to the slots 53' of the disk 53 but are respectively slightlyin advance of the slots 53 insofar as the rotative path of the drum 50is concerned. Therefore, by means now to be described, thespring-actuated plunger I08 is withdrawn from the recess H) l which itengages just previously to the entrance of the roller 54 into a slot 53to effect an indexing movement of the drum 50. This retraction of thespring-actuated holding plunger W5 is effected by the high portion ofthe cam 36, Figures 1 and 12, secured to the shaft 25, which cam portion38' engages a roller Hi2 mounted in one arm [94 of a bell crank leverpivotally mounted upon a pin (not shown) and whose other arm [66 ispivotally connected to the plunger E33 by a pin ml. The plunger I08normally is urged toward the disk IOI by a spring (not shown) and theeffect of the pivotal movement of the bell crank lever under the actionof the portion 33 of the cam 35 is to retract the plunger Hi8 away fromthe disk I51 and against the impulse of the spring.

The spring-actuated plunger 108 is permitted by the cam 30 to be movedinwardly of the disk which the drum 5!) IM to engage a slot I01 when theindexing move ment of the drum 50 by the action of the roller 54 on thearm 52 engaging a slot 53' has moved the axis of a slot lUIapproximately into alignment with the axis of the plunger I08, theroller 54 at substantially the same time passing out of the slot 53'with whose wall it has been engaged, which slot 53 is angularly adjacentto the rear of the recess lB'l' which is about to be engaged by theplunger I08, thus stopping the indexing movement of the drum 5!! andholding the latter stationary.

Each revolution of the cam shaft '25 efiects one withdrawal of thespring-actuated plunger I08 and one engagement of the roller 54 on thearm 52 with a slot 53' of the disk 53'to effect a ninety degree indexingmovement of the drum 53.

The detail whereby the milling cutters 8 are moved crosswise in bothdirections to effect milling operations upon diametrically opposedportions of the work pieces [0, which milling mechanism is theparticular subject matter claimed in the instant application, comprises,Figures 1, 6, 8, 9, 10, and 11, the cam 35 secured to the cam shaft 25 aspaced distance from and somewhat exteriorly of the right-hand sideplate I, together with cooperating mechanisms including a roller 31engaging the cam 35, Figures 6 and 8, this cam 35 being a grooved camwhose grooved portion is marked 36, and an outer diametrically enlargedplate or side face of the cam is indicated by 51, Figures 1, 6, and 8.The cam plate 5! is formed with a laterally-directed peripheralextension 51', clearly seen in Figures 1 and 8, which defines the groove36 and whose inner surface conforms to the opposed portions of theeffective roller-engaging surface of the cam 35.

The roller 31 is indicated in Figures 6 and 8 in the position in whichthe second and final milling operation is substantially completed andthe milling cutters 8 are about to be moved into their respectivecentral or neutral positions preliminarily to a dwell period withinwhich an indexing movement of the drum 50 through a quadrant will beeffected. Using the position of the roller 31 indicated in Figures 6 and8 as a starting point, a complete cycle of operations will now bedescribed:

First, a short dwell period during a small arc movement of the cam 35,indicated by a, Figure 8, then a comparatively rapid movement of themilling cutters 8 to central or neutral positions relative to theadjacent work pieces [5, during an arc movement of the cam 35, indicatedby b, then a dwell ofthe milling cutters 8 at the central or neutralpositions for a certain arc movement of the cam 35, indicated by C,while an indexing movement of the drum 50 is being effected, then acomparatively rapid non-cutting movement of the milling cutters 8transversely in one direction to points adjacent the portions upon oneside of the respective adjacent work pieces l8 which are to be milled,during a certain arc movement of the cam 35, indicated by d, then acomparatively slow transverse cutting movement of the milling cutters 8in the same direction to effect the milling operation upon said portionsof the flanges ill of the work pieces, during a certain arc movement ofthe cam 35, indicated by 6, then a short dwell period during a small arcmovement of the cam 35, indicated by f, then a comparatively rapidmovement of the milling cutters 8 in the opposite direction to positionsadjacent the other side portions of the adjacent work pieces I0 whichare to be milled, through an are movement of the cam 35, indicated by 9;when the roller 31 drops into the groove 35, then a comparatively slowmovement of the milling cutters 8 in the same direction to effect thesecond milling operation upon the flanges III of the work pieces In,through an arc of cam movement indicated by h, at which point a cyclehas been completed insofar as a description of all parts thereof isconcerned, although, as before stated, this particular described cyclewas commenced at the end of the second milling operation inasmuch as thecam roller 31 in Figures 6 and 8 is shown at that point.

It will be understood that the movements of a milling cutter 8 justdescribed result in any one milling cutter, with the exception of theright and left hand milling cutters f the six milling cutters, elfectingone milling operation upon each of two adjacent work pieces It upon thelefthand side of one work piece and the right-hand side of the adjacentwork piece. This action will be clearly understood from an inspection ofFigure 1. One of the end milling cutters 8 runs idly during each one ofthese milling periods, the right-hand end milling cutter 8 in Figure 1running idly when the other five cutters are working upon the left-handsides of the five work pieces I0, and the left-hand cutter 8 in Figure 1running idly when the other five cutters are working uponthe'rig'ht-hand sides of the work pieces Ill.

The cam roller 31 is rotatably mounted upon a pin I49, Figures 6 and 8,this pin I49 being fixed, interiorly of the cam 35, in a short dependenteX- tension 38 of an angular rock arm 38 and intermediate the ends ofone portion of the latter, which arm 38 is pivotally mounted on a pinI48, the end of this portion of the arm 38 being pivotally connectedwith a pin I30 with which is also pivotally connected the socketed hub I3| of an upwardly extending link I3I, Figures 1, 6, and 9, 1

which at its upper end is threaded in a socketed hub I3I pivotallysecured to a socketed hub I32 by a pin I29 upon which both of hubs I3Iand I 32 are pivoted and in the latter of which hubs is secured one endof a rod I32 whose other end is secured in a socketed hub I 32 Figures 9and 10, pivotally mounted upon a screw I33 secured in a rear framemember 9 and a slide backing I4, the hub I32 forming with a leverextension I36 a rocker arm having a forked end I36. The socketed hub I32' and the rod I32 pass through an opening formed in the right-handframe member I. The forked end I35 engages a bolt I34 secured to andseated in an extended portion I of a slide I5, Figures 1, 7, and 10, inwhich the rotatable spindles I are mounted. The bolt I34 passes throughthe slide backing I4 formed with an opening I 31 for the play of thebolt I34. The slide portion I5, Figures 6, '7, 9, and 10, is a reardove-tailed sliding portion which engages a complementary portion I 4formed upon the inner face of the slide backing I4. The latter issecured to the frame member 9 by screws 74, Figure 7, at the rear of thetop portion of the machine immediately to the rear of the rotatablespindles I. A gib I8 is provided at the top between the adjacent slidingsurfaces of the members I4 and I5. Thus, due to the contour of theeffective surface formed upon the cam 35, the spindles I and hence themilling cutters 8, are traversed transversely of the "work pieces II! inthe manner and in the sequence herein'before mentioned.

The other portion of the angular rock arm 38, Figures 6 and 8, extendsdownwardly and supports a roller I52 rotatably mounted on a pin I 50located at the lower end ofthe downward exten-' sion of this rock armportion. Adirectin'g lug I53 extended outwardly from the cam plate 51tilts the rock arm 38 by means of the roller I52 and positively forcesdownwardly the short dependent extension 38 of the rock arm 38 and,hence, the roller 31, so that the latter is directed into the groove 36during the arcuate cam movement g. The friction of the sliding portionI5 of the slide I5, Figure 7, in the dove-tailed slideway I4 of thebacking I4 is sufficient to maintain the cam roller 31 in intimatecontact with the high part of the cam 35 and to prevent the roller 31from moving away from the high part of the cam;

The transversely movable slide I5 in which the rotatable spindles I aremounted is a multiple-part member consisting of the main slide portionI5 and the plurality of spindle housings I'I, Figure 7, which arealigned with the main slide portion I5 by keys I8. Furthermore, thespindle housings H are secured to the slide portion I5 by bolts I9,Figures 1 and 11, which pass through adjacent contacting portions of theannular housings I1 and are threaded in the main slide portion I5.Surrounding the upper stem portions of the spindles 1, Figure 7, arecompression springs 22 which bear at their lower ends against lowerenlarged sliding abutment portions 23 of the spindles I and at theirupper ends against fixed ball races 24. These ball races 24 are fixed bythreaded collars 26 which engage upwardly-extending flanges II of thespindle housings I'I. Sleeve liners or bushings 39 are provided for theenlarged spindle abutment members 23; as also, 011 seals 49.

Certain adjustments of the machine elements are provided asffollows:

The transverse strokes of the rotatable spindlesmay be varied byadjustments of the link I3I and the rod I32, Figures 1, '6, and 9,which, it will be noted, are of turnbuckle construction by reason oftheir threaded engagement at least at one of their two ends with thesocketed hub members I SI and J3! and socketed hub members I32 and I32respectively. The depth of the milling cuts can be varied by adjustmentsof nuts 2?, 27, Figure 7 engaging the tops of the spindles I and bearingupon the hubs of the sprockets 92 or gears 93. The stroke of theholding-fingerreleasing cams 45 can be varied by an adjustment or thelink '43, Figure 6, which has screwthreaded engagement at least at oneof its two ends with the socketed hub members 59 and 63.

Means are provided whereby the 'work pieces I0 are clamped in the workholder 55 when they are in the milling position. This action is effectedby clamping finger portions I43 of longitudinal rocker arms I43 mountedupon a transverse shaft I44, Figures '1, 2, 3, 6, and 1.1, the rear endbody portion of the rocker arms I43 being controlled by vertical springsI45, Figure 11, so as to cause the clamping fingers I43 normally to beardown upon the flanges ID of the work pieces I0. One end of each springI46 is secured to an angle I41 mounted upon and extended between theside plates I and the other end to the rear end of a rocker arm I43. Inorder to efiect the release of the work pieces III from the holdingpressure of the fingers I43, when one bank of work pieces I0 .is leavingand the following bank of work pieces I0 .is entering the millingstation E at the top of the drum 59, a cam 40, Figures 1, 6, and 12, issecured to the cam shaft 25 adjacently exterior of the milling cam 35and is engaged by a roller 4| pivotally mounted upon a pin I54 which issecured in one end portion 42 of a rocker arm, the other end portion 42of which pivotally supports a pin I Intermediate its ends the rocker arm42-42 is pivotally mounted upon the pin I43.

Upon the pin I5I is also 'pivotally mounted a link 7 consisting of asocketed hub 59 formed with a threaded extension 43 engaged at itsopposite end in a tapped hub 63 pivotally secured by a pin I39 to an endportion of a rocker arm 44 pivotally mounted adjacent its opposite endupon a transverse shaft I42 to which is secured a eries of rocker camsI45 disposed adjacent the bodies of the respective rocker arms I43 butnormally slightl spaced therefrom. However, when an extended portion 40'of the cam 40, Figure 6, is engaged by the roller 4I, the arm 44 isrocked to cause the cams I45 to bear upon the clamping arms I43 to rockthe same against the action of the spring I45, Figure 11, and thus liftthe clamping fingers I43 upwardly away from the flanges Ill of the workpieces I0. Normally the cams I45 are held in non-efiective positionrelative to the rocker arms I43 by a tension spring I40, Figures 1 and6, secured at one end to the pin I39. The other end of the spring I45 issecured to a pin I4I mounted in and projecting from the adjacent sideframe member I.

The means for stamping the work pieces I!) with the identifying indiciaI2, Figure 4, at station C, Figure 11, of the rotatable drum 5B areshown in Figures 11 and 12. This subject matter is particularly shown,described, and claimed in U. S. Letters Patent No. 2,420,613, upon Workmarking assemblies for machine tools, which resulted from a divisionalapplication of the aforementioned Patent No. 2,381,921. The stamping isdone by spring-actuated longitudinal plungers 68, one plunger for eachof the work holders 55 in a bank of Work holders, these plungers 58having rear stem portion 68' and being provided at their front ends withdies I3 suitable for embossing the desired identification I2, such asshown in Figure 4. The plungers 68 are slidably mounted in the frontplate III). of a fixed bed member III), and the stem portions 68 thereofare slidably mounted in the rear plate I II! of the bed member III] andalso in the vertical leg N2 of a longitudinally movable angular memberII2 having a longitudinal base portion II2' slidable on inwardlyextending base flanges H0 of bed IIB. In the normal retracted positionof the springs I2 shown in Figure 11, the vertical leg II2 of theangular member H2 is disposed adjacently rearwardly of and substantiallyparallel with the rear plate III] of the bed member III]. Thecompression springs I2 are mounted in the bed IIIl around the plungerstems 58 between the rear abutment face of the plungers 58 and theinside rear face of the rear bed plate H0 The springs I2 are undercompression when the longitudinally-movable plunger 68 are in their rearposition, Figure 11, but, when these springs I2 are free to act, theydrive the plungers 68 rapidly forwardly to cause the die portions I3thereof to' make the desired marking upon the flanges of the work piecesII) mounted in the work holders 55 at the station C.

Means are provided for normally holding the plungers 6B in theirrearmost position and thus maintaining the springs I2 under compression,and such means include a transversely movable plate 65 adapted to engagewith notches (not shown) formed in the left side of the plungers 68.When the movable plate 55 is shifted to the left, the plungers 68 arereleased and are free under the impulse of the springs I2 to effecttheir marking function. The plate 65 is transversely movable between theside plates of the bed member III], and a free space (not shown) betweenthe left side plate of the bed member III] and the'left edge of theplate 65 is provided into which the plate 55 can be shifted during itsdisengaging movement.

The means for shifting the plate 65 to the left to disengage it from theplunger notches include a trigger 65, Figure 11, lying in the path ofmovement of a beveled cam portion 45 provided upon the right-hand faceof the worm Wheel 46, Figures 11 and 12, secured to the shaft 25. Thistrigger 66 is pivoted intermediate its ends on a pin II mounted in asupport plate I24 for the plungerholding plate 55 and lying flush at itsrear face with the front face of saidholding plate 65, the trigger 66having an upper nose portion 55 which engages the holding plate 65adjacent the righthand edge of the latter, thus moving the holding plate55 to the left when the trigger 65 is tripped by the cam portion 45,which action is timed to take place when the work pieces III are at thestation-"0 in position for the marking operation. As soon as the camportion 45 passes the trigger 55, by which time the plungers 68 havebeen retracted as hereinafter described, the holding plate 55 is movedto the right into engaging position with the notches formed on the leftside of the plungers 58, by a spring 69, Figure 11, secured at one endto a pin I0 depending from the base of the plate 65 and at its other endto a pin 51, Figures 1 and 6, secured in the right-hand frame member I.

The retraction of the plungers 58 to effect the compression of thesprings I2, and to permit the right-hand edge of the plunger-holdingplate 55 to be brought into alignment with the notches formed upon theleft-hand side of the plungers 68 is effected from a cam 50, Figures 11and 12, secured to the shaft 25, which cam 60 is engaged by a roller 6|rotatably mounted on a pin I55 fixed in a short rearwardly extending ear52' of an actuating lever 62 pivoted at its lower end upon a pin I IImounted on the base 2, the lever 52 having a loose pivotal connection atits upper end with a pin 83 secured in opposed ears 98' of a bracket 98fastened by screws to'the under face of the base N2 of the angularmember IIZ. As soon as the roller BI is released from the high point ofthe cam 60, i. e., as soon as the plungers 58 are fully retracted andthe springs I2 compressed, and the plungers 68 locked by the movement tothe right of the holding plate 65, the lever 62 and, hence, the angularmember H2 is pulled forwardly, into the positions shown in Figure 11, bya tension spring I5I secured at one end by a pin I58 to the base 2 andat its opposite end to a pin I59 mounted in the lever 62. The rearwardretracting movement of the plungers 68 is effected by the pressure ofthe vertical leg II2 of the angular member II2 upon rear abutmentmembers I60 secured to the plunger stems 68', and the action of thetension spring I5I eases off the leg II2 from the abutments I60, withouteifecting any movement of the plungers 58, so that the final relativepositions of the several parts are those indicated in Figure 11. Theabutments I60 are fixed, but they are adjustably fixed by means of nuts84, and this adjustment is so made that the stroke of the plungers 58during their marking action does not cause the abutments I60 to contactthe leg portion II 2 of the angular member H2. Annular metal bushingsl2l are driven into or otherwise fastened in the rear bed plate I I [1and annular bushings I23 are likewise fastened in the front bed plate H.These bushings I2! and I23 provide sliding surfaces, respectively, forthe plunger stems 68' and the plunger bodies 58. A key (not shown) isfixed in the bore of the bushing I23 and engages a keyway formed in theplunger 68 whereby the plunger 68 is rotatably fixed so that thelocation of the marked i-ndicia [2, Figure 4, on the work piece I0 maybe controlled. As clearly appears in Figure 11, the plunger body 68 andplunger stem 68' are slidably mounted in the support plate I24, in theplunger-holding plate 55, and in the leg member II2 of the angularmember H2, in addition to being provided sliding surfaces through thefixed bed plate H0 by the annular metal bushings I2l and I23, the holesthrough the plunger-holding plate 65 providing such sliding movement ofthe plungers 68 being enlarged and of a generally elliptical formationto provide for the relative transverse movements of the holding plate'65 relative to the plungers 68.

The ejecting of the milled and marked work pieces I0, while the drum 5!]is making its third indexing movement, between the stations C and D,Figure 11, is effected by a cylindrical tube 28 which rolls freelywithinthe chamber of the drum 50 and tends to stay on the bottom of thedrum 50 by gravity as the latter rotates. Inasmuch as the inner ends ofthe knock-out pins 31, Figures a cooperating sliding surface, arotatable milling spindle mounted in the head, means for rotating thespindle, a shaft rotatably mounted in the frame and means for rotatingthe same, a plate secured to the shaft and having a flange formed with aroller groove, the flange having a cam surface with a low part forming awall of the groove, a roller engaged by the cam,v a pivotal support forthe roller in which it is rotatably mounted, and connections betweensaid support and the milling head effecting reciprocatory slidingmovements of the latter, the milling head engaging theframe withfrictional resistance to sliding movement sufficient to maintain theroller in intimate contact with the high point of the cam, andcooperating means mounted on the plate and the roller support forpositively directing the roller into the groove.

2.. Milling mechanism having a frame, a milling block slidable therein,a plurality of spaced rotatable milling spindles mounted in the block,means for rotating the spindles, a shaft rotatably mounted in the frameand means for rotating the same, a plate secured to the shaft and havinga segmental peripheral laterally-extended flange, the plate bein formedwith a laterally-projected cam surface portion lying, in part, withinand under the peripheral flange segment, a roller engaging the camsurface, a laterally-extended pin upon which the roller is rotatablymounted, a support in which the pin is mounted, an outwardly-projectedlug secured to the periphery of the plate,

3 and 11, extend into this drum chamber and are freely movable throughthe work-plate extension holes 56' and their flanged ends can engage theinner ends of the work pieces l0 within the extended portions of thework holders 55, the weight of the tube 28 moves the knock-out pins 3iagainst the inner ends of the work pieces I0 and ejects them from thework holders -55 and outwardly of the drum 5!] whence they are directedby a guard or chute 34, Figure 11, outwardly of the machine.

In order that the surfaces of the work holders 55 may be kept clear ofchips; grit or other obstructions, an upwardly-extended flexible brush29, Figure 11, seated at its base in a transversely extended framemember 48 plays at its upper end over these work holder surfaces as thedrum 50 is rotated.

What I claim is:

1, Milling mechanism having a frame formed with a sliding surface, amilling head formed with a pivotal mounting for the support, a secondroller rotatably mounted in the support on one side of the pivotalmounting and adapted to be engaged by the lug, and connections securedto the support upon the opposite side of the pivotal mounting andassociated with the milling block to impart to the latter reciprocatorysliding movements. ERIC T. NORD.

R FERE ES CITE The following references are of record the file of thispatent:

UNlTED STATE PA ENTS umber Name Dat 319,429 Smith et al. June 2, 18351,216,018 Trundle i, Feb. 13, 1917 "1,494,377 Schmidt i May 20, 192432,353,480 Marsilius .i l July 11, 1944

